Optimal generation of pulsed entangled photon pairs
Juan F. Hodelin, G. Khoury, Dirk Bouwmeester · Physical Review A · 2006
We experimentally investigate a double-pass parametric down-conversion scheme for producing pulsed, polarization-entangled photon pairs with high visibility. The amplitudes for creating photon pairs on each pass interfere to compensate for distinguishing characteristics that normally degrade two-photon visibility. The result is a high-flux source of polarization-entangled photon pulses that does not require spectral filtering. We observe quantum interference visibility of over 95% without the use of spectral filters for $200\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ pulses, and up to 98.1% with $5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ bandwidth filters.